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Harshad n.  and  uban n.

First numbers that belong to both sets:

1, 2, 3, 5, 6, 7, 8, 9, 10, 12, 18, 20, 21, 27, 30, 36, 40, 42, 45, 48, 50, 60, 63, 70, 72, 80, 81, 90, 1000000, 1000002, 1000006, 1000008, 1000010, 1000011, 1000012, 1000016, 1000017, 1000020, 1000026, 1000032, 1000035, 1000040, 1000050, 1000053, 1000056, 1000062, 1000071, 1000076, 1000080, 1000090, 1000092, 1000095, 1000096, 1000098, 2000000, 2000001, 2000005, 2000007, 2000009, 2000010, 2000016, 2000020, 2000022, 2000025, 2000028, 2000030, 2000040, 2000043, 2000052, 2000061, 2000070, 2000080, 2000085, 2000088, 3000000, 3000006, 3000008, 3000012, 3000015, 3000020, 3000030, 3000032, 3000033, 3000036, 3000042, 3000051, 3000060, 3000070, 3000072, 3000075, 3000078, 3000096, 5000000, 5000002, 5000006, 5000008, 5000010, 5000013, 5000016, 5000022, 5000031, 5000040, 5000050, 5000052, 5000055, 5000057, 5000058, 5000059, 5000072, 5000076, 5000079, 6000000, 6000001, 6000003, 6000005, 6000007, 6000008, 6000012, 6000021, 6000030, 6000040, 6000045, 6000048, 6000060, 6000065, 6000066, 6000067, 6000078, 6000090, 7000000, 7000002, 7000006, 7000011, 7000020, 7000030, 7000032, 7000035, 7000038, 7000056, 7000070, 7000073, 7000075, 7000077, 7000080, 7000092, 8000000, 8000001, 8000003, 8000005, 8000006, 8000010, 8000020, 8000025, 8000028, 8000040, 8000046, 8000070, 8000076, 8000080, 8000081, 8000082, 8000083, 8000088, 9000000, 9000002, 9000010, 9000012, 9000015, 9000016, 9000018, 9000036, 9000060, 9000072, 9000075, 9000090, 9000091, 9000096, 9000099, 10000000, 10000002, 10000008, 10000010, 10000011, 10000012, 10000016, 10000017, 10000020, 10000026, 10000032, 10000035, 10000040, 10000050, 10000053, 10000056, 10000060, 10000062, 10000071, 10000080, 10000090, 10000092, 10000095, 10000096, 10000097, 10000098, 10000099, 11000000, 11000001, 11000007, 11000010, 11000016, 11000020, 11000022, 11000025, 11000028, 11000030, 11000040, 11000043, 11000052, 11000061, 11000066, 11000070, 11000080, 11000085, 11000088, 12000000, 12000006, 12000012, 12000015, 12000020, 12000030, 12000032, 12000033, 12000036, 12000042, 12000051, 12000060, 12000070, 12000072, 12000075, 12000078, 12000096, 13000000, 13000002, 13000005, 13000008, 13000010, 13000020, 13000023, 13000032, 13000040, 13000041, 13000048, 13000050, 13000060, 13000065, 13000068, 13000080, 13000086, 15000000, 15000003, 15000012, 15000021, 15000030, 15000040, 15000045, 15000048, 15000060, 15000062, 15000066, 15000069, 15000090, 16000002, 16000011, 16000020, 16000030, 16000032, 16000035, 16000038, 16000056, 16000068.

Some larger examples :